Yes gearboxes are the same. A V2 is a V2 is a V2. You only get problems if you want "special" functionality such as the VFC bolt release or the G&G EBB (which sucks anyways and you should disable it if you have one)
G&P bodies are only a problem if you want to put certain rail systems on them. You will either need a tap and die set or to use a G&P specific barrel nut.
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